SMPS repair with part No. HF100W-SB-13.8

Thread Starter

sanjay76

Joined Jul 6, 2011
4
Hi,

I am trying to repair SMPS with part No. HF100W-SB-13.8.

This SMPS can give O/Ps in two ways- first when connect AC mainsto it ( which is working fine i.e we get the required O/P when we connect AC mains to it)secondly when battery is connected it should give the required O/P (which it is not giving).

P.S.

1) I dont have schematics of this SMPS.
2) Was not able to find data sheet of Transistor with marking on it as "K 940".
3) This SMPS comes in two types - one in which two separate comprators (part No. LM393) are used and secondely in which one comparator (part no. LM393N) is used.
4) The problem is found in only SMPS having two comparators.

Please advise.

Regards

Sanjay
 

debjit625

Joined Apr 17, 2010
790
Their is a minimum amount of voltage specification for both AC and DC to be input for the SMPS to it work properly.Whats that specification?
 

Thread Starter

sanjay76

Joined Jul 6, 2011
4
Their is a minimum amount of voltage specification for both AC and DC to be input for the SMPS to it work properly.Whats that specification?
The specifications are:

AC input 115v(85-132v) 2.8A
230v(170-260v) 1.5A

DC output V: 13.8v 6.0A
BAT: 13.3 0.5A
 

praondevou

Joined Jul 9, 2011
2,942
How many layers does this PCB have? If it's only two layers you can try to draw your own schematic of the parts that have a relation to this function.

If not you can also post a picture of both sides of the pcb (in high resolution)
 
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